Need help with blending preservatives and boosters
Hello, I have started formulating skincare products on a small scale. At this point, I only have the ability to purchase from redistributors like Formulators Sample Shop, Lotion Crafter, Making Cosmetics etc. I have been trying a lot of different preservatives but would like to simplify my ingredient stock.
I am looking for guidance/resources on formaldehyde-free preservatives for products for sensitive skin…mainly o/w lotions & serums. Most products are <5.5pH but I do have some formulas with Niacinamide w/pH around 6.1
I always use a chelator (typically Sodium Phytate / Dermofeel PA-3) and airless or UV protected containers. I also tend to use Propanediol instead of Glycerin, is this helping as an additional booster?
I have had good results with Euxyl PE 9010-but should I be adding additional boosters? i.e sodium benzoate or GMCY if working with plant-based extracts?Or should I be blending the PE9010 with another “broad spectrum” preservative blend? If so, how do I figure out the correct ratio/% of each preservative when mixing/blending in a formula?
I would like to move away from Phenoxyethanol but do not like the odor of benzyl alcohol. Any recommendations for preservatives that do not have a strong odor (i.e Geoguard ECT and Euxyl K903). I have had good results with Linatural Ultra 3, but I am struggling to meet the MQO at this stage.
Thank you very much for your time and knowledge…I have been trying for a while to find information to answer these questions without luck!